Article for electrolytical purposes.



(389,148, tiled February 17,1911 oi particles by the fillltl'lilolfiil 31o Drawing.

T (ZZZ wits-:22 2 2 Be it known at Borne @ciranum, subject of the it geror of Germany. and resident of Franliiortouthcin, Germany have invented certa n newand useful improvements in Art s ior Electrolytical Purposes of which the iolloiving is specification.

The invention product or article p electrolytical purpos cal or electrochemical 7 improved cularly adapted for o for use in chemiever a refractory. r us 11. rial. adapted to resist high cle 're l L or the action of chemical is equired.

Preferably imgrcvcd product is produced by the process described and. claimed in an earlier aioolication Serial Number M which the present case is division; which. may be briefly described follows:

if the product is to be made, for example, from carhorundum or corundum, the process is carried out as follows: The raw material is finely ground and elntriated. The elutriation is advantageously carried out hy suspending the finely ground material in Water to which is added a basic substance such as ammonia it tie material treated is 0' an electro-nega-tire character, such as rhorundum, for example, or it such niatuinl is electro-pori "e character such corunduin. an such as acetic acid is added. To the finest particles thus obtained Which have been separated from the coarser U and suspension in the water used for elutriation and hence obtained in an exceedingly finely divided condition. and in a; condition comparable with that particles of a colloidal nature, enough Water is added to produce a paste which can l e formed or molded into the desired shape. The articles thus "formed (an e.

are ren ered capable oi being so molded and limrned- Without the addition of foreign binding medium. in the case ot such an FRANK?ORT-0N-THE-1VAICN, GEBILEANY, ASSIGNGF TO G-ESELL- USE 131:. BK, OF FEANKTEOET-ON-THE-MhZN, GERMANY.

. Divides and this app1icacsulizahlc material as ,curhornndum, the.

non-oxidizing or reducing atmosphere as an oxidizing or an oxidizing current of air would convert a portion of the finely divided carhoruiulum into silicic acid, the presence of which in the final product would render tie latter liahle to crack or expand. he roduct or article thus obtained dill'ers those produced by 'prcces es heretoc-re employed in that the particles thereof ot hound together by melting or fusion, or by means of a molten binding medium t formed into a coherent porous.

being brought into direct contact with one another and by burning. lilo fusible flux or binding medium is present-in the product. manufacture of the material to employ an unstable or removable binding medium such,

bears in the course of further treatment of desired the carborundum, corunduzn, etc, may be suitably treated to remove any natu: ral impurities contained therein before molding and burning the article.

Articles made from the material obtained above described are hard and give a metallic sound when struck. The form and surface thereof are not affected by the burning operation and they may either have a rough or smooth surface or even a reflecting surface imparted thereto by being properly molded. Patterns or ornamentation applied to the articles before drying and burning are not changedihy the burning process. Asthe articles do not contain any foreign matter they have the stability and resistance of the original substance, carhorundum or col-undum, and may be used for various phrposes.

material are adapted for electrolytical purposes in which there may he an acid at one side of the diaphragm. find on the opposite side thereof an alkaline electrolyte. The material possesses a high degree of porosity and is refractory and unafi'ected by chemical influence.

llaving thus described the invention, What is claimed and desired to be secured by Letters Patent, is: a K I 1. As an article of manufacture, a molded l bod y of naturally non-plastic refractory mahuruing is advantageously carried out in a It is sometimes advantageous in the for example, as starch, which either disapthe material or is afterward removed. ii

In particular diaphsagms made from such.

tizi l y fron'i impurities and binding 2. Jun-ariicle for eleotrolyiical purposes comprising naturally noz'i-plastio refractory :umlerial nmtle'up of particles of colloidal nature in a porous coherent uncl refractory molded form, substantially free from in1- purities and binding media.

3, A diaphragm for olectroiytioal pur poses comprising a molclecl article of naiurzilly noirplzistlc refractory material made up of particles of a colloidal nature, in a orous coherent form ancl substautially free Irom impurities and binding media.

41-. An article for elecirolyticul purposes comprising carborunclum in a porous c0- ilOIEDtand refractory molded form, substantially free from impurities ZLllCi oxidation products.

.fk cliziphragn'i for electrolylical purposes comprising a molded article of carbor'uuclum in El. PUl' Um. l1ereut form, subslahtiully free from impurities and oxida- (ion products.

(3. An all'irle for eleolirolytical purposes comprising rarlmrundum mudo up of parl'irlus of a oollohlul nature in a porous coherent unrl refractory molded i'orln, substanliully free from in'ipuritios and binding media.

7. i'l diaphragm for eleclrolyl'ieal purposes (:on'iprising a molded urliele ol 021F100 llll'ldlllll made up of particles of u colloidal nature in a porous coherent and refractory molded form, substantially frco from immriiies and binding media.

In teslimony whereof, I zliiix my signature in presence of two Wilnessesi U BOTHO SCl'lVVER-IN.

Witnesses HENRY HAsPEu, VVOLDEMAR HA'UPT. 

